cottrell



(No Model.) 2 Sheets-Sheet '1. G. COTTRELL.

ROLLER MILL.

No. 356,623. Patented Jan. 25,1887.

a. PETERS, Pharc-umo nnfinr, Washingian. D. c

No Model.) 2 Sheet Shet 2.

G. OOTTRELL.

ROLLER MILL.

No. 356,623 Patented Jan. 25, 1887.

Unrrnn Srnrns n'rnnr @rrrhrs GEORGE COTTRELL, OF SAN FRANCISCO, CALIFORNIA.

ROLLER-MlLL.

EQPECIFICATION forming part of Letters Patent No. 356,623, dated January 25, 188?.

Applicniion fifcd A ngust 2, 1886.

1'0 (ZZZ 207101 12, it may concern.-

Be it known that I, GEORGE Cor-'rRnLL, of the city and county of San Francisco, State of California, have invented an Improvement in .Rollenlllills; and I hereby declare the following to be a full, clear, and exact description of the same.

My invention relates to that class of machines used in the manufacture of flour which are commonly lrnown as ro'ller-millsfl and my in vention consists in the mechanisms, which I shall hereinafter fully describe and claim, for effecting the various adjustments of the machine.

The object of niyiuvention is to providesimple and elfectivc means for adjusting the rolls of the mill.

Referring to the accompanying drawings for a more complete explanation of my invention, Figure 1 is an elevation of my roller-mill, the

adjusting mechanism at one end being in section. 2 is aplnn of the rolienmill, partly in section, a portion of the center being left open to show the shalt J. Fig. 3 is a perspective View oi one of the wedges used for vertically adj nsting the boxes.

A is the frame of the null. in which is contained the usual parallel rolls, B, Whose journals Z) are mounted in the boxes (3 C on the sides of the frame. Theinnerlooxes, 0', have a slight vertical adjustment, as I shall hereinafter explain, and the outer boxes, 0, have a horizontal sliding movement in order to adjust their rolls to or from the adjacent ones. The main or principal adjustment of these outer boxes, G, is the one by which their rolls are primarily set up parallel for their work, and I effect this by means of the screw-spindles I), each having a hand-wl1eel,d, on the outer end, and threaded at the inner end in a bar, 0, which is secured to the base 0 of the hex, said box being mounted and traveling in a suitable frame or seat, 0 which also serves as a guide for the bar c.

E is a holding-spring for each box G, the tension of which is adjusted by the screw 6, both spring and screw being above the spindle D. These devices are at each corner of the frame.

By operating the spindles D it will be seen Serial Nofldl glli. (No model.)

that the boxes 0 maybe adj usted toward or from the boxes C. When thefeed ceases, it is necessary to spread the rolls innncdiately, in order to prevent their grinding together. In order to accomplish this I have the following mechanism:

F are levers, the upper ends of which are fitted loosely upon the outer ends of the spin dies 1), just inside of their heads or handwheels (1. These levers are fulcruincdloosely on bearings f, hung on the spindles, and through their lower ends loosely puss screws G, on the outer ends of which are fitted nuts 9, which bear against the cute r surfaces of the lovers F.

Secured rigidly to the screws G are cranks H, to the lower ends of which are connected rods It, the other ends of which are connected with the pivoted operating-lever I at points on each side of the pivotal center of said lever.

When it is desired to spread the rolls quickly, the lover I is thrown over to one side, whereby, through the connectingrods hand the cranks H, the screws G are turned sufficiently to draw in their nuts 5! and cause them to 'press the lower ends of the levers F inwardly toward the machine. These levers, fulcruining on their bearings f, bear with their upper ends against the hand-Wheels or heads :2 of the screw-spindles D, whereby said spindles are .i'orced outwardly, thus drawing the boxes G away from their adjacent boxes U and spreading the rolls. This mechanism, as described thus far, simply refers to that at one end of the machine. order to operate these mechanisms at both ends of the machine simultaneously, I have a rockshaft, J, which passes in suit-able bearings longitudinally under the machine from end to end. The hub of each lover I is pivoted loosely on the shaft J, but is thrown into engagement therewith by means of small slots iin said hub engaging projections or lugs j on a shoulder near the end of the shaft, said engagement being fixed by means of a handout, K, screwed into the end of the shaft and bearing against the hub of the lover I. This fixes the lever to the shaft. As shown in Fig. 2, the other end of the shaft J is provided with similar mechanism. Now,it will be seen that by operating the lever I at one end of the machine the shaft r00 necessary to withd raw the sliding rolls slightly for the purpose of accurately setting them. In order to accomplish this I have on the inner ends of the screws G worm -pinions g, with which mesh worms Z on shafts L, passing transversely under the machine at each end, and having on their ends the hand-wheels Z. By operating these wheels the screws G are slightly turned, and this movement, through the levers F, causes the adj ustmentor setting of the rolls.

The inner boxes,0, of each set of rolls have, as I have before stated, a vertical adjustment in order to level them. This is usually accomplished by means of screws passing up from below and bearing on the under surfaces of the boxes. Instead of these means, I provide a wedge, M, for each inner box, which is inserted under the box,and is operated by a screw, m, bearing against its thick end, said wedge being guided in its movement, by being slotted, over a pin or screw, in, which passes up through it from below. By properly moving this wedge the vertical adjustment of the box may be easily and accurately effected.

It will be observed that in my machine the screw-spindles D do not pass through the holding-springs Eofthe boxes, but are under the and entirely separated therefrom.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a roller-mill, the sliding boxes G and the spindles D, connected with the boxes, in combination with the means for spreading the rolls, consisting ofthe pivoted levers F, mounted at their upper ends on the spindles DI, the screws G and nuts 9 in the lower ends of the levers, the cranks H on said screws,'the pivoted lever I, and the connecting-rods It, all arranged and adapted to operate substantially. as herein described.

2. In a roller-mill, the sliding boxes C, haw.

ing guide-bars c, the spindles D, screwed into the ends of the bars, and having heads (I, by

which they are operated to adjust the rolls primarily, in combination with the means for ing-rods h, substantiallyas herein described.

3. In a roller-mill, the sliding boxes 0 and the spindles D,'connected therewith, in combination with the pivoted levers F, secured at their upper ends on said spindles, the screws G and nuts 9 at the lower ends of the levers, the cranks II on said screws, the levers I, the connecting-rods h, the rock-shaft J, passing under the machine, and an adjustable connec-. tion between the levers I and the ends of the shaft J, whereby one or both sets of rolls may be spread, substantially as herein described;

4. In a roller-mill, the sliding boxes 0 and the spindles D, connected therewith, in combi nation with the pivoted levers F, secured at the upper ends to the spindles, the screws G and nuts g at the lower ends of the levers, the cranks H on the screws, thelevers I and connecting-rods h, the rock-shaft J under the machine, and an adjustable connection between the levers I and the ends of the shaft J, consisting of theslotted hubs t of the levers, the lugsj on the shaft, and the hand-nuts K, substantially as herein described.

5. In a roller-mill, the sliding boxes 0 and l the spindles D, connected therewith, in combination with the pivoted levers F, secured at their upper ends on the spindles, the screws G and nuts 9 at the lower ends of the levers, the worin-pinions g on said screws, the crossshafts L, and the wormsl on said shafts, mesh ing with the pinions g,whereby the rolls may beadjustably set, substantially as herein described.

In witness whereof I have hereunto set my hand.

GEORGE COTTRELL.

Witnesses:

S. H. NOURSE, H. 0. LEE. 

